Grinding and polishing machine.



J. C. BLEVNEY.

GRINDING AND POLISHING MACHINE.

APPLICATION FILED MAR. 26. I914. 1,134,508, Patented Apr. 6,1915.

5 SHEETS-SHEET 1,

INVENTOR flnhqCIElw a BY 5W /5 E l W ATTORNEYS I. C. BLEVNEY.

GRINDING AND POLISHINGMAC HINE. APPLICATION HLED MAR. 26, 1914.

1 1 34,500 Patented Apr. 6, 1915.

6 SHIBETSSHEET 2.

INVENTOR ATTORNEYS WITNESSES:

.l. C. BLEVNEY.

GRINDING AND POLISHING MACHINE.

APPLICATION, FILED MAR. 26. 1914.

Patented Apr. 6, 1915.

5 SHEETBSHEET 3.

J a j; 25 2 s5 xiii? 2? 47%? L? 7 35 33 1:5: I| I i I-- L I J4WITNESSES: 6 f? 3/ 37 INVENTOR %Z qflDhZg/DBIIEW ,g h nhwgl v imywuwATTORNEYS J. C. BLEVNEY.

GRINDING AND POLISHING MACHINE.

APPLICATION FILED MAR. 26, 19.14.

1 1 84,5089 Patented Apr. 6, 1915.

5 SHEETS-SHEET 4.

WITNESSES: INVENTOR 'ILI II hr [IL B12112 fwfi/XQM. W

ATTORNEYS J. C. BLEVNEY.

GRINDING AND POLISHING MACHINE.

APPLICATION FILED MAR. 26. I914.

L1 Patented Apr. 1915.

5 SHEETS-SHBET 5.

WITNESSES: INVENTOR S fluhr EEIEYI E QM X K M, .zwg/ qw AT ORNFYS JOHNC. BLEVNEY, 0F NEWARK, NEW JERSEY.

GRINDING AND POLISHING- MACHINE.

memos.

Specification of Letters Patent.

Application filed March 26, 1914. Serial No. 827,284.

To all whom it may concern:

Be it known that I, J OHN G. BLnvNEY, a citizen of the United States,residing at Newark, in the county of Essex and State of New Jersey, haveinvented certain new and useful Improvements in Grinding and PolishingMachines; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as w1 ll. enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accom anying drawings, and to characters of re erencemarked thereon, which form a part of th1sspec1fication.

This invention has reference, generally, to improvements in grinding andpolishing machinery; and the said invention relates, more particularly,to a novel construction of machine for grinding and polishing the roughuneven surfaces of metal castings, and the like.

The invention has for its principal object to provide an eflicientconstruction of apparatus adapted to automatically grind and.

polish the rough uneven surfaces of metal castings, and the like, toprovide the same with an apparently smooth evenly finished surface,without, however, unduly grinding off the high spots or points formingthe surface inequalities of the said castings, so that said castings areweakened or rendered too thin by the loss of metal. To accomplish thisend I provide a novel means for pressing the abrading elements of themachine in contact with all portions of the area of the unequal surfaceof the castings with substantial uniformity.

Another object of the present invention is to provide a novel means forfeeding the castings in contact with the abrading elements of themachine, so that the casting is moved laterally across the faces of theabrading elements, and at the same time I provide for a correspondingrelative movement of the means for pressing the abrading elements to thesurfaces of the casting. I

'A still further object ofthe invention is to provide, in connectionwith the novel work feeding means, devices whereby the movement of thework is accelerated, in ad- 'justable ratios, with relation to themovedefined and described in the following specification.

Other objects of the present invention, not at this time moreparticularly enumerated, will be clearly understood from the followingdetailed description of this invention.

With the various objects of the present invention in view, the sameconsists, primarily, in the novel grinding and polishing machinehereinafter set forth; and, the invention consists, furthermore, in thenovel arrangements and combinations of the several devices and parts, aswell as in the details of the construction of the same, all of whichwill be more fully described in the following specification, and thenfinally embodied in the claims which are appended to and which form anessential part of the said specifications.

The invention is clearly illustrated in the accompanying drawings, inwhichz- Figure 1 is a front elevation of the grinding and polishingmachine made according to and embodying one form of my presentinvention. Fig. 2 is a vertical longitudinal section of the same, takenon line 22 in said Fig. 1. Fig. 3 is a detail vertical section similarto said Fig. 2, but confined more especially to the work feedingmechanism and associated parts, said view being drawn on an enlargedscale, and the limit of the operative movement of the various partstherein illustrated being indicated by dotted 'line representation. Fig. 4 is a detail transverse section taken on line 4:4 in said Fig. 3,looking in the direction of the arrow as; and Fig. 5 is a detailhorizontal section taken on line 55 in said Fig. 4, looking downward;the limit of the operative movement of the various parts illustrated inboth Figs. 4 and 5 being indicated by dotted representation in saidrespective views. Fig. 6 is a detail longitudinal vertical section ofone of the devices comprising the. means for pressing the abradingelements of the machine to the work. Fig. 7 is a view similar to thatshown in Fig. 5, but illustrating a slightly modified construction andarrangement of the means for pressing the abradin elements of themachine to the work.

Similar characters of reference are employed in all of the hereinabovedescribed views, to indicate corresponding parts.

Referring now to said drawings the reference character 1 indicates thebase of the Patented Apr. 6, 31915.

novel grinding and polishing machine form,- ing one embodiment of mypresent invention, the same being provided upon its sides withtransverse guide-channels 2. Mounted upon said base 1 are a pair oflaterally movable standards 3, the lower, ends of which are providedwith retaining-plates 4, which ride in said guide-channels 2, and which,while permitting the lateral movement of said standards 3 upon the base1, prevent any displacement of the same from said base 1.

Journaled in the lower portion of each standard 3 are shafts 5. One ofsaid shafts 5 is provided with a driving pulley 6. Secured upon theforwardly projecting end of each shaft 5 is a pulley-whee1 7. Therespective pulley-wheels 7 must preferably be drawn in oppositedirections, and while each could be driven separately to accomplish thisend, I prefer to use the following driving means. The shaft 5 which isdriven by the driving pulley 6'is provided with a pulley 8 over whichruns the belt 9. Said belt is carried over a pulley 10 mounted rotatablywithin said base 1, thence passing over a pulley 11 whichis journaled inmovable bearings 12 secured within said base 1, thence over a pulley 13connected with the other of said shafts 5, thence being carried over apulley 14 mounted rotatably within said base 1, thence over a pulley 15which is journa'led in movable bearings 16 secured within said base 1,and thence returning over the said pulley 8. The said belt 9 is twistedin' those portions of its stretches which extend between the pulleys 10and 11 and the pulleys 14 and 15, so that said stretches of the beltwill pass each other without interference. By such an arrangement itwill be apparent that the driven,

shaft 5 will transmit its rotation to the other shaft 5, the rotation ofthe latter beingreversed, so that the respective pulley-wheels 7 will bedriven in opposite directions.

The reference character 17 indicates pulley wheels which are rotatablyjournaled in movable bearingmembers 18 which arerespectively mounted inconnection with the respective standards 3.

The reference character 19 indicates pulley-wheels which are rotatablyjournaled in movable bearing members 20 which are respectively mountedin connection with the respective standards 3.

The reference character 21 indicatesbacking belts having transverselygrooved outer faces, the same respectively running over the pulleywheels 7 and 17 of each standard 3.

he reference character 22 indicates abrading belts, the outer surfacesof which are provided with a covering of some suitable abrading materialsuch as carborundum emery or the like. The said abrading belts 22 extendover the pulley wheels 19 of each standard so as to pass around and overthe opposite directions, and in turn drive saidabrading belts 22, whichthey back, also in opposite directions. The respective pulley wheels 7and 17 of each standard 3 are so arranged and alined relatively to onean other that the inner stretches of said back ing belts, and thatportion of said abrading belts riding upon said inner stretches, arecaused to run parallel to each other, the abrading surfaces of therespective abrading belts facing each other so that a casting or otherwork to be ground may be inserted therebetween so that the oppositefaces of the same are simultaneously operated upon by said abradingbelts. Since the sizes and thicknesses of the castings desired to be groundmay be various it is of course necessary to mount the respectiveabrading belts so that the distance between their paralleling surfacesmay be varied to properly accommodate the size of casting to be operatedupon, and to this end said standards 3 are made movable upon said base1, as above inprovided with a pair of bearing blocks 24.

Journaled in and extending between oppositely facing bearing blocks 24are a pair of supporting shafts 25 and 25' from which depend pairs ofparallel lever-members 26 and 26'. Connected pivotally with the lowerends of said lever-members 26 and 26 by means of bolts 27 is a carriertable 28. By

reason of its supportby the parallel levermembers said carrier table 28is always maintained in a level horizontal position even during theforward swinging movement of the same as controlled by saidlevermembers.

Various forms of work holding devices may be secured upon said carriertable 28 each being suited to the shape of the work to be operated upon.In the drawings, as an example of one of such work holding de vices, Ihave illustrated a work holding means adapted to carry a casting such asa wrench-frame for Stillson wrenches, the same comprising an angle-plateor bracket 29, the same being secured upon said carrier table by meansof anchor-bolts 30, the heads of which are secured in one of a pluralityof inverted T shaped grooves 31, which extend transversel across saidcarrier table. face of sai angle-plate or bracket 29 is provided with apair of yoke-pieces 32 through The I memos the openings of which extendsa movable carrier-arm 33. Said carrier-arm is slidable in saidyoke-pieces toward the abrading belts 22, and the same is provided witha stop-pin 34, which engaging one of said yoke-pieces limits itsinwardly pushed movement. When pushed inward said carrierarm is lockedagainst any backward or outward movement by means of a notch or cutawayportion 35, which is provided in its upper marginal edge, and whichreceives the upper portion of one of said yoke-pieces. Said carrier-armbeing so constructed that its inner end overbalances its outer end, itsnotch or cutaway portion 35 is caused to embrace said yoke-piece by theupward tilting of the outer end of said carrier-arm. When it is desiredto release the carrier-arm from such locked position its outer end ismerely pushed downward to disengage said notch or cutaway portion fromits embracing position, whereupon the carrier-arm may be drawn backwardor outward. The inner end of said carrier-arm is properly formed toconform to the wrench-frame 36, so that the latter may be dropped uponsaid inner end of the carrier-arm and there held against anylongitudinal movement upon said carrier-arm. When said parallellevermembers 26 and 26' are swung inwardly it will be apparent that theinner end of said carrier-arm, upon which is mounted the wrench-frame36, will be moved inward and will thereupon carry the latter between andin contact with the respective abrading belts 22. This inward swingingmovement of said parallel lever-members 26 and 26 is accomplished bymeans of the following system of counterbalanced. operating levers,comprising a fulcrum link 37 the inner end 4 of which is pivotallyconnected with a stud 38 which projects from the inner side of one ofsaid standards 3. The said fulcrum link extends outwardly between saidpairs of parallel lever-members 26 and 26, and pivotally connected withthe same, so as to be fulcrumed upon its free end is a hand-lever 39,from which extends outwardly an arm 40. Pivotally connected with thefree end of said arm 40 is a link-member 41, which extends inwardly, sothat its inner end is pivotally connected with one end of acounter-balance lever 42, the latter being fulcrumed upon said stud 38,and having adjustably fixed upon its opposite end a counter-balanceweight 43. Connected with and extending transversely between saidlevermembers 26 of said parallel lever-members is a cross-bar.44 havingperforations 45 carry the carrier-table and work holding deviceconnected therewith inwardly toward said abrading belts 22. -The weightof said parallel lever-members and the parts connected therewith iscounter-balanced by the c0unter-balance lever 42 and the weight 43connected therewitln'and which is synchronously operated in properdirections by the movement of said link-member 41 with which they areconnected.

Secured to the inner side surface of each standard 3 is a guide-member47 in which is slidably disposed a carrier-bar 48. Secured to the freeend of each carrier-bar 48 is a bracket-member 49 to which are pivotallyconnected pairs of parallel suspending levers 50 and 50'. Pivotallysecured between the lower free ends of said parallel suspending levers50 and 50.- are carrier-plates 51. The said carrier-bars 48 and saidcarrierplates 51 thus suspended therefrom, are so disposed as to bepresented in a plane behind the inner stretches of the superimposedportions of said backing belts 21 and abrading belts 22. Mounted uponeach carrier-plate 51, and conveniently afiixed thereto, are devicesadaptedto be moved into contact with area of their pressing orcontacting ends conform substantially both to the outline and area ofthe surface of the casting or other work against which they are designedto press the abrading-belt 22, as backed by the backing-belt 21. Eachpressing-finger 53 is provided at its inner end with a tailpiece 55 ofsubstantially reduced cross-sectional area with relation to thecross-sectional area of the main body of the said pressing-finger.Secured within said framework 52 is a resilient element, preferably inthe form of a block of soft rubber 56, against which the ends of saidtail-pieces 55 contact to resiliently or yieldingly back saidpressing-fingers 53. Each pressing-finger 53 is further provided with asuitably dis-r posed cutaway-portion 57 which embraces a companionstop-member 58 for each pressing-finger, which stop-members are suitablyafiixed in stationary relation to said framework 52, and since saidcutaway-portions 57 are longer than thewidth of said stopmembers alimited longitudinal movement of' said pressing-fingers 53 is permittedwithout permitting the same to be disconnected from their properlyassociated relation with said frame-work 52. c

Aflixed to the outer ends of each carrierplate 51 is a cam-plate 59 theouter. edge of which forms an outwardly curved cam-portion 60.

The reference character61 indicates adjustable yoke-members which areadjustably related to the said parallel lever-members 26 and 26.Connected with, and extending between said yoke-pieces 61 is a cross-bar62. Each carrier-bar 18 is provided with a stud 63, and interconnectingeach stud 63 with said cross-bar 62 are connecting-links 6 1,

the same having a plurality of notches 65 adjacent to each end thereof,which may be selectively engaged respectively with said studs 63 andsaid cross-bar 62 to properly position said pressing devices carried bysaid carrier-bars 48 relatively to said work carrying) devices carriedby said parallel levermem ers 26 and 26', so that a simultaneous inwardmovement toward said abrading elements of all said parts may be causedby the inward swinging movement of said parallel lever-members 26 and26. The normal positions of said carrier-plates 51, as supported by saidsuspending levers 50 and 50, and

consequently of said pressing devices carried by said carrier-plates 51,are such that the free ends 5 1 of the pressing-fingers 53 are normallyremoved from the plane of said superimposed stretches of said backingand abrading belts, these positions being determined by stop-members 66which are secured to each bracket-member 49, and against which thesuspending-levers 50 50 are brought to rest when said carrier-plates 51and the pressing devices mounted thereon, are free, under the force ofgravity, to swing away from said belts.

The reference character 67 indicates baseplates which are respectivelysecured to the forward faces of said standards 3 in suitable locations.Secured to each base-plate is an outwardly extending bracket 68.Fulcrumod in the free end of each'bracket 68 is a pressure lever 69.Each bracket 68 is provided on one side with a downwardly extending wallor flange 70, having a suitably disposed opening or perforation'71therein. The tail 72 of said pressure lever 69 is stopped against saidwall or flange 70, thus fixing its normal position. Pivotally connectedwith said tail 72 of said pressurelever 69 is a rod 73 which extendsthrough the opening or perforation 71 of said wall or flange and whichis thus caused to extend outwardly therefrom. The free end of said rod73 is screw threaded so as to receive thereon lock-nuts 74. Arrangedupon said rod between said lock-nuts 74 and said wall or flange 70 is apressure spring 75. With said Wall or flange 70 as a base and saidlocknuts as a point of purchase said pressure spring 75 exerts anoutwardly moving pressure upon said rod 73 and consequently upon saidpressure-lever 69, thereby normally maintaining the latter in itsstopped position with its tail 72 against the inner side of said wall orflange 7 0, and its outer free end projected into the path of saidcam-plate 59 connected with each of said carrier-plates 51. Said outerfree end of said pressure-lever 69 is provided with an anti-frictionroller 76. When said carrierplates 51 are carried inward by the inwardlyswinging movement of said parallel levermembers 26 and 26, as abovedescribed, the cam-plates 59 are moved into contact with theanti-friction rollers 76 of said pressure-' levers 69, and as thisinward movement is continued the cam-portions 60 ride upon saidanti-friction rollers 76. The result of this movement is to cause aforward swinging movement of said carrier-plates 51, as suspended bysaid suspension levers 50 and 50, toward the superimposed stretches ofsaid backing and abrading belts, so that by the time the work entersbetween the opposed operative surfaces of the abrading belts the saidpressing devices carried by said carrier plates 51 are moved inwardly"whereby the free ends 54: of the pressingfingers are brought intocontact with the back of thesuperimposed stretches of said backing andabrading belts. It will be apparent that when the pressing devices arethus brought into contact with the said backing and abrading belts, thesame are held yieldingly in contact with the said belts by reason of thetension or pressure of said pressure-springs 75, as transmitted to saidcarrier-plates 51 and the pressing devices su ported thereon by thepressure-levers 69; this yieldable condition being in addition to theresilient backing of the individual pressing-fingers 53, asalready abovedescribed. Owing to the interconnected relation of said carrier-bars -48with said parallel levermembers 26 and 26, the pressing devicessuspended from said carr1er-bars 48 will move inwardly simultaneouslywith the inward movement of the work to be operated upon as carried bysaid carrier-table 28 and the work-supporting devices mounted thereon,but since the means interconnecting said carrier-bars 48 with saidparallel lever-memmemos and the cross-bar 62 connected therewith,

are secured-to said parallel lever-members 26 and 26 at points betweenthe extremities of said lever-members and their fulcrums, it followsthat the radius of the arc of movement of said yoke-members 61 andcross-bar 62 is shorter than the radius of the arc of movement of saidcarrier-table 28, consequently upon the inward swinging movement of saidparallel lever-members 26 and 26, the distance of travel of saidpressing devices relative to the distance of travel of said work to beoperated upon will ,be less than the latter. The work as it passesbetween the abrading elements is also given a slight vertical movementrelative to the pressing devices, and this is by reason of the fact thatthe table 28 swinging on said parallel lever members 26 and 26 describesa descending arc, which not only causes the work to be carried laterallyacross the abrading surface of the abrading elements but also verticallymoves the work as well. This vertical movement of the work is relativeto the pressing members since the latter, being supported by saidcarrier-bars 48 do not move vertically but only laterally across theabrading elements. The ratio of the respective lateral movements of saidpressing devices and the work to be operated upon as thus accomplishedis subject to adjustment by reason of means for securing saidyoke-members 61 in various positions in con-' nection with saidlever-members 26 and 26, whereby said yoke-members 61 and crossbar 62may be positioned nearer to or farther away from the fulcrums of saidlevermembers. This means of adjustment comprises the provision in saidparallel levermembers of a pluralitv of longitudinally disposedperforations or openings 77, and in the provision of longitudinallydisposed perforation or openings 78 in the vertical portions of saidyoke-members 61. Any selected opening or perforation 78 may beregistered with any of said openings or perforations 77 whereby thedesired distance of said yoke-members61 and cross-bar 62 from thefulcrums of said lever-members, relative to the distance of the work assupported by said carrier-table 28 on work sup porting devices suspendedby said levermembers, may be secured. When the yokemembers 61 are thuspositioned fastening screws or pins 79 may be inserted through the saidregistered openings or perforations. As previously mentioned the saidstandards 3 are movable laterally away from or -toward each other forthe purpose of properly spacing the superimposed stretches of saidbacking and abrading belts from each other so that the latter will beproperly spaced to accommodate the width of the work to be insertedtherebetween. It follows that any 5 adjustment of said standards 3 willrequire members may be moved laterally to a proper adJusted position.When thus properly positioned the said shafts 25 and 25 are retainedagainst further longitudinal movement by means of a pair of stop-collars80 which are positioned on opposite sides ofcertain of saidbearing-blocks 24:, and then looked upon said shafts.

Having thus described the general construction of the various devicesand detailed parts comprising the novel grinding and polishing machineembodying the principles of my invention, it remains to describe theoperations, uses, and advantages of the same. The said novel grindingand polishing machine is adapted to be used to finish the surfaces ofrough castings, and the like. The surfaces of such castings are usuallyrough and contain in their surface area inequalities comprising high andlow spots, which are due to unequal shrinkage of the metal when cooling,and to warping and similar causes. It is desirable to so grind suchsurfaces as to not only smooth off the roughness of the surface but toeliminate the appearance of these inequalities, so that said surfacesappear even, level and smooth even while the inequalities comprising thehigh and low spots remain. But this finished appearance must beaccomplished without grinding down said high spots to the plane of saidlow spots of the surface of said castlng, since such method would tendto weaken the casting. To accomplish the desired result I provide thenovel pressing devices whereby the abrading belt is pressed withsubstantial uniformity upon all points of the area of the surface to beground, and at the same time by moving the work, while in contact withthe abrading belts relatively to the ends of the pressing fingers 53, sothat the latter do not press the abradingbelts against only a givenportion of the surface of the work, but rather ride in and out of theinequalities of the surface. Such action of the fingers 53 is obtainedby providing the different ratios of traveling movement of the work andpressing-devices as accomplished by the inward movement of said parallellever-members 26 and 26 in the manner above described.

As illustrative of the character of the work adapted to be operated uponby my machine, I have selected as an example a wrench-frame 36, such asforms a part of the usual construction of Stillson-wrenches.

The said wrench-frame 36 is mounted upon the end of the c rrier-arm 33,which'is then thrust to its inwardly moved position. The hand-lever 39is then pulled downwardly to swing inwardly the parallel lever members26 and 26, which causes the in-' ward movement of said carrier-table 28and said carrier-arm 33, thereby inserting said wrench-frame 36 betweenthe opposed faces of said abrading-belts 22. As the wrenchframe 36passes between the abrading-belts 22, the pressing devices are alsomoved inwardly, and operating in the manner above described aresimultaneously forced toward said superimposed stretches of said backingand abrading belts. The pressing-fingers 53 thereupon engage thebacking-belts 21 and press the same, and the abrading belts 22 imposedthereon, against the side surfaces of the wrenchrframe 36. A continuedmovement of said lever-members-26 and 26( will then move thewrench-frame across the abrading surfaces of the belts 22, and thismovement is followed by a corresponding movement of the pressing-fingers53. But since the arc of travel of said pressing-fingers 53 is less thanthe arc 'of travel of said work or wrench-frame 36 (as already abovedescribed), the latter travels faster across the belts than the former,consequently its surfaces are constantly shifting in'advance of oracross the abrading belt as pressed forward by said pressing-fingers 53,so that the latter, in effect, cause said abrading belts to ride in andout of the hollows or low spotssof the casting or surface of thewrench-frame 36, and consequently the moving abrading belt contacts withsubstantial. uniformity with all portions of the surface area of saidwrench frame, rendering the lines of abrasion on said surfacecontinuous, even and uniform, so that to all appearance the sur ace ofthe castingor wrench frame 36 is seemingly level and even. lever-members26 and 26 withdraws'said wrench frame 36 from contact with the abradingbelts 22, and the samemay be removed from the carrier-arm 33, andanother wrench-frame replaced thereon for a repetition of the abovedescribed oper- A reverse movement of the,

are provided with laterally disposed housing-portions 82 in which areslidably disposed the tail-portions 83 of pressing-members 84. Securedto the ends of said tailportions 83 are the cam-plates 59 provided withthe cam-portionsGO. The said pressing-members 8e are normally registeredopposite the work 85 carried by the carrierarm 33 of the work-holdingmeans. When the said table 28, as supported by said parallellever-members 26 and 26', is moved inwardly toward said abradingelements the work 85 is carried between said abrading elements 22, andthe pressing-members 84 are carried in back of said abrading elements.Simultaneously said cams 60 of said camplates 59 contacting with therollers 76 of the spring actuated pressure-levers 69, the pressingmembers are caused to move in contact with the abrading elements forcingthe same in contact with the work 85, this contact being yieldable byreason of the spring contact 'of said pressure-levers 69. Since thepressing-members 84 are mounted in connection with said table 28 it willbe apparent that the same are caused to move simultaneously with thework and laterally across the abrading elements uniformly with the work.For certain classes of work this arrangement and operation is moredesirable than the ar- .rangement and operation of the heretofore Istruction.

As many changes may be made in the above described construction of myinvention and its detail parts, and many apparently widely differentembodiments of my invention could be made without departing from thescope thereof, I intend that' all matter contained in the abovedescription or shown in the accompanying drawings shall be interpretedas illustrative and not in a limiting sense. I desire it also understoodthat the language used in the following claims is intended to cover allgeneric and specific features of the invention herein described, and allstatements of the scope of the invention, which, as a matterof language,might be said to fall therebetween. Hence, I do not-limit my presentinvention to the exact arrangements and combinations of the devices andparts as described in the said specification, nor do I confine myself tothe exact details of the construction of the said parts, as illustratedin the accompanying drawings.

1. In a device of the class described, an abrading means, means forfeeding the work to be ground in contact therewith, means for pressingsaid abrading means to the work, and means for causing said pressingmeans to travel with the work while the .pressing said abrading means tothe work,

said pressing means having a pressing'surface of substantially the sameconformation and outline as the surface of the work to be ground, andmeans for producing simultaneous accompanying lateral movements of saidpressing means and said work while respectively in contact with oppositesides of said abrading means.

3. In a device of the class described, an abrading means, means forpressing said abrading means to the work, and means for producingvariable relative lateral movements of said pressing means and said workwhile respectively in contact with opposite sides of the abrading means.

i. In a device of the class described, an abrading means, means forfeeding the work to be ground in contact therewith, means for pressingsaid abrading means yieldingly to the work, means for synchronouslymoving said pressing means into operative contact with said abradingmeans upon the introduction of the work to the latter, and means forproducing variable relative lateral movements of said pressing means andsaid work while respectively in contact with opposite sides of saidabrading means.

5. In a device of the kind described, abrading'means adapted to engageopposite sides of a piece of work, a carrier table provided with workholding means, parallel lever members upon the free ends of which saidcarrier-table is suspended, means for swinging said parallel levermembers toward and away from said abrading means' to feed the worklaterally across and in contact with said abrading means, movable meansfor pressing said abrading means to the work, means for holding saidpressing means yieldingly against the backs of said abrading means, and

connecting said pressmg means with said parallel lever members whereby agreater or less proportional lateral movement of said pressing meansrelative to the lateral movement of said work is produced.

6. In a device of the class described, abrading means adapted to engageopposite sides of a piece of work, means for pressing said abradingmeans to the work, a work holding means, and means for controlling themovements of said pressing means and said work holding means whereby thework and said pressing means are caused to travel laterally across theabrading means while respectively in contact with opposite sides of saidabrading means.

7. In a device of the class described, abrading means adapted to engageopposite means for adjustably sides of a piece of work, means forpressing said abrading means to the work, means for forcing saidpressing means yieldingly in engagement with said abrading means, a workholding means, and means for synchronously controlling the movements ofsaid pressing means and said work holding means whereby the work andsaid pressing means are caused to travel laterally across the abradingmeans while respectively in contact with opposite sides of said abradingmeans.

8. In a device of the class described, a pair of oppositely facingabrading belts, means for supporting and driving the same, a workholding means, means for moving said work holding means to carry thework to and move the same laterally between said abrading belts, andmeans movable toward the backs of said abrading belts for pressing saidabrading belts against said work while the latter moves in contact withthe former.

9. In a device of the class described, a pair of oppositely facingabrading belts, means for supporting and driving the same, means forfeeding the work to be ground between and laterally across the faces ofthe same, means for pressing said abrading belts to the work, and meansinterconnecting said pressing means with said work feeding means wherebysaid pressing means are moved laterally across the rear sides of saidabrading belts synchonously with the movement of said work laterallybetween and in contact with said abrading belts.

10. In a device of the class described, a pair of oppositely facingabrading belts, means for supporting and driving the same, means forfeeding the work to be ground between and laterally across the faces ofthe same, means for pressing said abrading belts to the work, meansinterconnecting said pressing means with said Work feeding means wherebysaid pressing means are moved laterally acrossthe rear sides of saidabrading belts synchronously with the movement of said work laterallybetween and in contact with said abrading belts, and

means for adjusting the interconnected rework and disposed at rightangles to the plane of said abrading belts, and a resilient meansengaging the rear ends of said pressing-fingers, a carrying means forsupporting said frame-work and its pressing-fingers, means engageable bysaid carrying means for moving the latter toward the backs of saidabrading belts and holding the same yieldingly with relation to saidabrading belts, and means interconnecting said carrying means with saidwork feeding means whereby said pressing-fingers carried thereby aremoved laterally across the backs of said abrading belts synchronouslywith the movement of said work laterally between and in contact withsaid abrading belts. I

12. In a device of the class described, a pair of oppositely facingabrading belts, means for supporting and driving the same, means forfeeding the work to be ground between and laterally across the faces ofthe same, means for pressing said abrading belts to the work comprising,a frame-work, longitudinally and independently movable pressing-fingersmounted in said frame-work and disposed at right angles to the plane ofsaid abrading belts, and a resilient means engaging the rear ends ofsaid pressingfingers, a carrying means for supporting said frame-workand its pressing-fingers, means engageable by said carrying means formoving the latter toward the backs of said abrading belts and holdingthe same yieldingly with relation to said abrading belts, meansinterconnecting said carryingmeans with said work feeding means wherebysaid pressing-fingers carried thereby are I moved laterally across thebacks of said abrading belts synchronously with the movement of saidwork laterally between and in contact with said abrading belts, andmeans for adjusting the interconnected relation of said carrying meanswith said work feeding means whereby the ratio of the lateral movementof said pressing-fingers may be varied with relation to the lateralmovement of said work.

13. In a device of the class described, a base, a pair of standardsmovable upon said base, each standard having means for mounting anabrading belt, said abrading belts being mounted with their innerstretches facing each other,-means for driving said abrading belts, acarrier-table provided with work holding means, means for suspendingsaid carrier-table so that the same may be swung toward said abradingbelts to feed the work to be ground between and laterally across thefaces of the same, means for pressing said abrading belts to the work,means for forcing said pressing means yieldingly in engagement with saidabrading belts, and means for synchronously controlling the movements ofsaid pressing means and said carrier table whereby the work and saidpressing means are caused to travel laterally across the abrading beltswhile respectively in contact with opposite sides of said abradingbelts.

l4. In a device of the class described, a v pair of oppositely facingabrading belts, means for supporting and driving the same,

a carrier-table provided with work-holding means, and parallel levermembers for suspending said carrier-table so that the same may be swungtoward said abrading belts to feed the work to be ground between andlaterally across the faces of said abrading belts. I

15. In a device of the class described, a pair of oppositely facingabrading belts, means for supporting and driving the same,

a carrier-table provided with work-holding means, parallel lever membersfor suspendmg said carrier-table so that the same may 35 be swung towardsaid abrading belts to feed the work to be ground between and laterallyacross the faces of said abrading belts, means for pressing saidabrading belts to the work, and means interconnecting said pressingmeans with said parallel lever members whereby said pressing means aremoved laterally across the rear sides of said abrading beltssynchronously with the movement of said work laterally between and incontact with said abrading belts.

16. In a device of the class described, a pair of oppositely facingabrading belts, means for supporting and driving the same,

a carrier-table provided with work-holding means, parallel lever membersfor suspending said carrier-table so that the same may work laterallybetween and in contact with said abrading belts, and means for adjustingthe interconnected relation of said pressing means with said parallellever-members whereby the ratio of the lateral movement of said pressingmeans may be varied with re vlation to the lateral movementof said work.

17.,In a device of the class described, a pair of oppositely facingabrading belts, standards provided with means for supporting and drivingsaid abrading belts, a base upon which said standards are movablysupported so as to be adjustable toward or away from each other, acarrier-table provided with work-holding means, bracket membersprojecting from said standards, a lateral shaft journaled in saidbracket members, parallel lever members depending from said shaft forsuspending said-carrier-table 1 so that the same may be swung towardsaid abrading belts to feed the work to be ground between and laterallyacross the faces of said abrading belts, and means for controlling themovements of said parallel lever members.

18. In a device of the class described, a pair of oppositely facingabrading belts, standards provided with means for supporting and drivingsaid abrading belts, a base upon which said standards are movablysupported so as to be adjustable toward or away rom each other, acarrier-table provided with work-holding means, bracket-membersprojecting from said standards, a lateral shaft journaled in saidbracket members. parallel lever members depending from said shaft forsuspending said carrier-table so that the same may be swung toward saidabrading belts to feed the work to be ground between and laterallyacross the faces of said abrading belts, means for controlling themovements of said parallel lever members, means for pressing saidabrading belts to the work, and means interconnecting said pressingmeans with said parallel lever members whereby said pressing means aremoved laterally across the rear sides of said abrading beltssynchronously with the movement of said work laterally between and incontact with said abrading belts.

19. In a device of the class described, a pair of oppositely facingabrading belts, standards provided with means for supporting and drivingsaid abrading belts, a base upon which said standards are movablysupported so as to be adjustable toward or away from each other, acarrier-table provided with work-holding means, bracket membersprojecting from said standards, a lateral shaft journaled in saidbracket members, parallel lever members depending from said shaft forsuspending said carrier-table so that the same may be swung toward saidabrading belts to feed the work to be ground between and laterallyacross the faces of said abrading belts, means for controlling themovements of said parallel lever members, means for pressing saidabrading belts to the work, means interconnecting said pressing meanswith said parallel lever members whereby said pressing means are movedlaterally across the rear sides of said ahrading belts synchronouslywith the movement of said work laterally between and in contact withsaid abrading belts, and means for adjusting the interconnected relationof said pressing means with said parallel levermembers whereby the ratioof the lateral movement of said pressing means may be varied withrelation to the lateral movement of said work.

20. In a device'of the class described, a pair of oppositely facingabrading belts, standards provided with means for supporting and drivingsaid abrading belts, a base upon which said standards are movablysupported so as to be adjustable toward or away from each other, acarrier-table provided with work-holding means, bracket-membersprojecting from said standards, a lateral shaft journaled in saidbracket members, parallel lever members depending from said shaft, forsuspending said carrier-table so that the same may be swung toward saidabrading belts to feed the work to be ground between and laterallyacross the faces of said abrading belts, means for controlling themovements of said parallel lever members, carrier-bars slidably mountedto project'from the faces of said standards, carrier plates suspendedfrom said carrier-bars adapted to swing toward the backs of the opposedstretches of said abrading belts, a frame-work mounted on eachcarrier-plate, longitudinally and independently movable pressing fingersmounted in said framework and disposed at right angles to the plane ofsaid abrading belts, resilient means engaging the rear ends of saidpressing fingers, means engageable by said carrierplates for moving thesame toward the backs of said abrading belts and holding the sameyieldingly with relation to said abrading belts, and connecting linksbetween said carrier-bars and said parallel lever members whereby saidpressing-fingers are moved laterally across the backs of said abradingbelts synchronously with the movement of said work laterally between andin contact with said. abrading belts.

21. In a device of the class described, a pair of oppositely facingabrading belts, standards provided with means for supporting and drivingsaid abrading belts, a base upon. which said standards are movablysupported so as to be adjustable toward or away from each other, acarrier-table provided with work-holding means, bracket-membersprojecting from said standards, a lateral shaft journaled in saidbracket members parallel lever members depending from said shaft forsuspending said carrier-table so that the same may be swung toward saidabrading belts to feed the work to be ground between and laterallyacross the faces of said abrading belts, means. for controlling themovements of said parallel lever members, carrier bars slidably mountedto pro -ject from the faces of said standards, carrier plates suspendedfrom said carrier-bars adapted to swing toward the backs of the opposedstretches of said abrading belts, a

frame-work mounted on each carrier-plate, v

longitudinally and independently movable pressing fingers mounted insaid framework and disposed at right angles to the plane of saidabrading belts, resilient means engaging the rear ends of said pressingfingers means engageable by said carrier-plates for moving the sametoward the backs of said abrading belts and holding the same yieldinglywith relation to said abrading belts, connecting links between saidcarrierbars and said parallel lever members whereby said pressingfingers are moved laterally across the backs of said abrading beltssynchronously with the movement of said work laterally between and incontact with said abrading belts, and means for adjusting the connectedrelation of said connecting links with said parallel lever memberswhereby the ratio of the lateral movement of said pressing fingers maybe varied with relation to the lateral movement of said work.

:22. In a device of the class described, a pair of oppositely facingabrading belts, standards provided with means for supporting and drivingsaid abrading belts, a base upon which said standards are movablysupported so as to be adjustable, toward or away from each other, acarrier-table provided with work-holding means, bracketmembersprojecting from said standards, a lateral shaft journaled in saidbracket members, parallel lever members depending from said shaft forsuspending said carrier-table so that the same may be swung toward saidabrading belts to feed the work to be ground between and laterallyacross the faces of said abrading belts, means for controlling themovements of said parallel lever members, carrier-bars slidably mountedto project from the faces of said standards, carrier plates suspendedfrom said carrier-bars adaptedto swing toward the backs of the opposedstretches of said abrading belts, a frame-work mounted on eachcarrier-plate, longitudinally and independently movable pressing fingersmounted in said frame-work and disposed at right angles to the plane ofsaid abrading belts, resilient means engaging the rear ends of saidpressing fingers,

means engageable by said carrier-plates for moving the same toward thebacks of said abrading belts and holding the same yieldingly withrelation to said abrading belts, connecting links between saidcarrier-bars, and said parallel lever members whereby saidpressing-fingers are moved laterally across the backs of said abradingbelts synchronously with the movement of said work laterally between andin contact with said connected relation of said connecting abradingbelts, and means for adjustin the links with said parallel lever-memberswhereby the ratio of the lateral movement of said pressing fingers maybe varied with relation to the lateral movement of said work, comprisingyoke-members connected with said parallel lever members, means foradjustably securing said yoke-members nearer to or farther away from thefulcrum of said parallel lever members, and means connected from eachother, a carrier-table provided.

with work-holding means, bracket members projecting from said standards,a lateral shaft journaled in said bracket-members, parallel levermembers depending from said shaft for suspending said carrier-table sothat the same may be swung toward said abrading belts to feed the workto be ground between and laterally across the faces of said abradingbelts, means for controlling the movements of said parallel levermembers, carrier-bars slidably mounted to project from the faces of saidstandards, carrierplates suspended from said carrier-bars adapted toswing toward the backs of the opposed stretches of said abrading belts,a frame-work mounted on each carrier-plate, longitudinally andindependently movable pressing fingers mounted in said frame-work anddisposed at right angles to the plane of said abrading belts, resilientmeans engaging the rear-ends of said pressing fingers, a cam-plate atthe outer end of each carrierplate, aspring retained lever arm againstwhich said cam-plate moves to swing said carrier-plates toward the backsof said abrading belts and whereby the carrierplates are held yieldinglywith relation to said abrading-belts, and connecting links between saidcarrier-bars and said parallel lever members whereby said pressingfingers are moved laterally across the backs of said abrading beltssynchronously with the movea ment of said work laterally between and incontact with said abrading belts. 4

24. In a device of the class described, a pair of oppositely facingabrading belts, standards provided with means for support ing anddriving said abrading belts, a base upon which said standards aremovably supported so as to be adjustable toward or away from each other,a carrier-table provided with work-holding means, bracket-membersframe-work mounted on each carrier-plate, longitudinally andindependently movable pressing fingers mounted in said frame-work anddisposed at right angles to the plane of said abrading belts, resilientmeans engaging the rear-ends of said pressing fingers, a cam-plate atthe outer end of each carrierplate, a spring retained lever arm againstwhich said cam-plate moves to swing said carrier-plates toward the backsof said abrading belts and whereby the carrierplates are held yieldinglywith relation to said abrading-belts, connecting links between saidcarrier-bars and said parallel lever members whereby said pressingfingers are moved laterally across the backs of said abrading beltssynchronously with the movement of said work laterally between -and incontact with said abrading belts, and means for adjusting the connectedrelation of saidconnecting links with said parallel lever-memberswhereby the ratio of the lateral.movement of said pressing fingers maybe varied with relation to the lateral movement of said work.

25. In a device of the class described, a pair of oppositely facingabrading belts, standards provided with means for supporting and drivingsaid abrading belts, a base upon which said standards are movablysupported so as to be adjustable toward or away from each other, acarrier-table provided with work-holding means, bracket membersprojecting from said standards; a lateral shaft journaled in saidbracket members; parallel lever members depending from said shaft forsuspending said carrier-table so that the same may e swun toward saidabrading belts to feed the wor to be. ground between and laterallyacross the faces of said abrading belts, means for controlling themovements of saidparallel lever members, carrier-bars slidably mountedto project from the faces of said standards, carrierplates suspendedfrom said carrier-bars adapted to swing toward the backs of the opposedstretches of said abrading belts, a.

frame-work mounted on each carrier-plate, I

longitudinally and independently movable pressing fingers mounted insaid frame-work and dispose at right angles to the plane of saidabrading belts, resilient means engaging the rear-ends of said pressingfingers, a cam-plate at the outer end of each carrierplate, a springretained lever arm against which said cam-plate moves to swin saidcarrier-plates toward thebacks 0 said movement of said pressing fingersmay be varied with relation to the lateral movement of said work,comprising yoke-members connected with said parallel lever members,means for adjustably securing said yokemembers nearer to or farther awayfrom the fulcrum of said parallel lever members, and means connectedwith said yoke-members to which said connecting links are secured.

26. In a device of the class described, an abrading means, and meansforpressing said abrading means to the work to be ground,

comprising a supporting frame-work, a plurality of longitudinally andindependently movable pressing fingers the outer extremities of whichare directed toward said abrading means, portion of reduced crosssectional area, fixed body ofresilient material with which saidtail-portions contact.

In testimony, that I claim the invention set forth above I have hereuntoset my han this 24th day of March, 1914.

JOHN G. BLEVNEY.

Witnesses: I

GEORGE D. RIoHAnos,

Fanox H. W. Fmrm'rzan.

each pressing-finger having a tail and a-

